DOI: 10.1038/ngeo3024
论文题名: Millennial-scale iron fertilization of the eastern equatorial Pacific over the past 100,000 years
作者: Loveley M.R. ; Marcantonio F. ; Wisler M.M. ; Hertzberg J.E. ; Schmidt M.W. ; Lyle M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 10 起始页码: 760
结束页码: 764
语种: 英语
Scopus关键词: carbon dioxide
; core analysis
; deep water ventilation
; deglaciation
; dissolution
; dust
; equatorial dynamics
; global climate
; Heinrich event
; iron
; Last Glacial
; oxygenation
; respiration
; Atlantic Ocean
; Atlantic Ocean (North)
; Pacific Ocean
; Pacific Ocean (East)
; Southern Ocean
英文摘要: The eastern equatorial Pacific Ocean plays a crucial role in global climate, as it is a substantial source of CO2 to the atmosphere and accounts for a significant portion of global new export productivity. Here we present a 100,000-year sediment core from the eastern equatorial Pacific, and reconstruct dust flux, export productivity and bottom-water oxygenation using excess-230Th-derived fluxes of 232Th and barium, and authigenic uranium concentrations, respectively. We find that during the last glacial period (71,000 to 41,000 years ago), increased delivery of dust to the eastern equatorial Pacific was coeval with North Atlantic Heinrich stadial events. Millennial-scale pulses of increased dust flux coincided with episodes of heightened biological productivity, suggesting that dissolution of dust released iron that promoted ocean fertilization. We also find that periods of low atmospheric CO2 concentrations were associated with suboxic conditions and increased storage of respired carbon in the deep eastern equatorial Pacific. Increases in CO2 concentrations during the deglaciation are coincident with increases in deep Pacific and Southern Ocean water oxygenation levels. We suggest that deep-ocean ventilation was a primary control on CO2 outgassing in this region, with superimposed pulses of high productivity providing a negative feedback. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105697
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Geology and Geophysics, Texas AandM University, College Station, TX, United States; Department of Marine Sciences, University of Connecticut, Groton, CT, United States; Department of Ocean, Earth and Atmospheric Sciences, Old Dominion University, Norfolk, VA, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
Recommended Citation:
Loveley M.R.,Marcantonio F.,Wisler M.M.,et al. Millennial-scale iron fertilization of the eastern equatorial Pacific over the past 100,000 years[J]. Nature Geoscience,2017-01-01,10(10)